This is your problem. This chipset benchmarks at around at about 50% slower than a Nvidia Fx Go 5700, a score of 367 on 3Dmark 2005.
ref-
http://www.notebookcheck.net/ATI-Radeon-Xpress-1100.2174.0.htmlNotebooks rarely perform as gaming PC's due to their integrated grahpics.
You may be able to run this game on a build prior to GFX improvements. Perhaps v180 or there abouts. What res are you running at?
Another thing you might try is binding a joystick button to toggle "no cockpit" this way if your flying of cities with FLIR active and your fps chokes you can toggle the pit off/on. THis was a work around for low end systems in EE2.